A USAAS engineer sits on a three axes chair and demonstrates the examination for applicants for flying in the Unites States.

U.S. Army Air Service engineers demonstrate the Ruggels Orientation which is used to check the fitness of applicants for flying in the United States. The engineers stand near the machine used for the Ruggels Orientation. An engineer sits on a three axes chair and demonstrate its operation. An engineer sits in the machine and demonstrates the examination.